Working on a Vizio P42HDTV10A with only a standby light being shown when plugged in along with the audible click of a relay when its initially plugged in. I disconnected the power cable from main board to the power supply and is able to register vs and va voltage within specs when I flick the switch on the power supply from normal to Auto.. It won't register in normal position. With the cable disconnected at the main board I do get backlight present on the screen.
I suspect its probably a bad main board or possibly the logic board issue.
I suspect its probably a bad main board or possibly the logic board issue.